TW202026556A - Laser package structure - Google Patents

Abstract

A laser package structure comprises: a frame comprising a front circuit layer, a back circuit layer and an internal circuit layer positioned inside the frame, wherein the internal circuit layer has multiple circuit connection units, each circuit connection unit has a first connection through hole and a second connection through hole, the first connection through hole is connected to the front circuit layer, the second connection through hole is connected to the back circuit layer, the second connection through hole is positioned at one end portion of the circuit connection unit, and the first connection through hole is positioned at an inner side of the second connection through hole; and a laser chip fixed at the front circuit layer of the frame, and used to emit a first laser beam.

Description

Laser packaging structure and light source module

The invention relates to a laser, in particular to a high-power laser packaging structure, and a light source module including the laser packaging structure.

Since semiconductor lasers (LD) have excellent characteristics of good monochromaticity, small size, long life, high power density and high-speed operation, semiconductor lasers are used in laser ranging, laser radar, laser communication, laser Simulation weapons, automatic control, detection instruments and even medical beauty have been widely used, forming a broad market.

Therefore, the purpose of the present invention is to provide a laser package structure that can at least overcome the disadvantages of the prior art.

Therefore, the laser package structure of the present invention includes a bracket and at least one laser chip.

The bracket includes a bracket body having opposite first and second surfaces, a first circuit layer on the first surface of the bracket body, and a second circuit layer on the second surface of the bracket body, And an internal circuit layer embedded in the bracket body, the internal circuit layer has a plurality of circuit connection units, each circuit connection unit has a circuit block, a first conductive through connecting the circuit block and the first circuit layer A via, and a start end of a second conductive through-component group connecting the circuit block and the second circuit layer.

The at least one laser chip is fixed on the first circuit layer of the bracket and can emit a laser beam.

Another objective of the present invention is to provide another laser packaging structure.

Therefore, the laser package structure of the present invention includes a bracket and at least two laser chips.

The bracket includes a bracket body with a first surface and a second surface opposite to each other, a first circuit layer on the first surface of the bracket body, and a second circuit layer on the second surface of the bracket body, And an internal circuit layer embedded in the stent body. The first circuit layer includes at least two mounting units. Each mounting unit includes a first area and a second area spaced apart from each other. The internal circuit layer has multiple Circuit connection units, each circuit connection unit has a circuit block, a first conductive through-piece group connecting the circuit block and the first circuit layer, and a second conductive via connecting the circuit block and the second circuit layer Through-piece group.

The laser chip is respectively mounted on the first area of each mounting unit of the first circuit layer of the bracket and can emit a laser beam.

Another object of the present invention is to provide a light source module including one of the above-mentioned laser packaging structures.

The above laser packaging structure can be applied to car headlights, high bay lights, laser TVs or projectors, etc. Take laser headlights as an example. Laser headlights have a higher density of light output and a smaller luminous angle than LED headlights. The irradiation distance can reach 600 meters, which is twice as far as LED headlights.

The effect of the present invention is that through the design of the bracket, a single or multiple laser chips can be installed, and multiple laser chips can be independently controlled to be turned on or off according to requirements, and the brightness can be independently adjusted.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are represented by the same numbers.

1 to 4, a first embodiment of the laser package structure of the present invention includes a bracket 200, two laser chips (LD chips) 220 that can emit laser beams of different or the same wavelength, and an optical element 230, and a cover 240.

The bracket 200 includes a bracket body 210 as a package cup.

The bracket body has a bottom portion 211 and a side portion 212 extending upward from the periphery of the bottom portion 211. The bottom 211 and the side 212 jointly define a groove 213. The cross section of the groove 213 parallel to the first surface 2113 of the bracket body 210 is rectangular. The bottom of the bracket body 210 has a first surface 2113 and a second surface 2114 opposite to each other. The first surface 2113 is the upper surface of the bottom 211, and the second surface 2114 is the lower surface of the bottom 211. In this embodiment, preferably, the bottom portion 211 is step-shaped and includes a high portion 2111 and a low portion 2112 surrounded by the high portion 2111. In this embodiment, the bracket body 210 is preferably a ceramic bracket, which can be made of materials such as Al 2 O 3, AlN, etc., and has a circuit on it. The laser chips 220 are placed horizontally on the first surface 2113 of the bottom 211 of the holder body 210. Preferably, the laser chips 220 are directly arranged on a surface of the high portion 2111. The optical element 230 is disposed on a surface of the low portion 2112.

In this embodiment, the ceramic used for making the bracket body 210 may use a ceramic material with high thermal conductivity. The bracket body 210 has a packaging cup and a multilayer platform structure. The height difference d of the platform of the platform structure (that is, the height difference between the high portion 2111 and the low portion 2112) is 0.1 to 0.5 mm. Preferably, d may be 0.1 to 0.3 mm. The LD chips 220 are horizontally placed on a higher platform (ie, the high part 2111). The optical element 230 includes a high reflectivity and inclined side surface 231), and a top surface 232 away from the lower portion 2111 of the support body 210, and is placed on a lower platform (ie, the lower portion 2112). The light emitted by the LD chips 220 in the horizontal direction parallel to the first surface 2113 is reflected and converted into light perpendicular to the vertical direction of the first surface 2113 and emitted, thereby improving the light extraction efficiency in the normal direction of the package structure. Conducive to the optical design of the laser chip. Preferably, a light-emitting end surface 220A of the LD chip 220 is flush with a vertical surface 2115 of the support step. More preferably, the light-emitting end surface 220A of the LD chip 220 protrudes from the vertical surface 2115 of the step to prevent The light beam emitted by the LD chip 220 irradiates the die-bonding platform of the holder body 210 (that is, the high portion 2111).

More specifically, the top surface 232 of the optical element 230 is a platform suitable for picking up elements (not shown) by a nozzle in the packaging process. It should be noted that the function provided by the top surface 232 that can be used by the nozzle to pick up components is not necessary. Preferably, the area of the top surface is greater than 0.5 mm×0.5 mm. Further, the side surface 231 of the optical element 230 is formed with a high-reflectivity coating to include a reflective surface. The material of the high-reflectivity coating can be selected from metal reflective layers such as Ag, Al, and Au, or can be selected from oxide dielectric film reflective layers such as SiO2, TiO2, MgF2, and Al2O3. The number of reflective surfaces on the side surface 231 of the optical element 230 can be several, and the shapes or angles of different reflective surfaces can be different. In the case of multiple reflective surfaces, according to different application requirements, the angle of the reflective surface can be adjusted to control the overlap degree of the light spots of the multiple LD chips 220, so that the laser package structure has multiple Light sources with different luminous angles.

The cover 240 covers a top surface 214 of the bracket body 210 for sealing the components located in the groove 213 of the bracket body 210. The cover 240 and the bracket 210 can be sealed by filling silicon or Au-Sn eutectic. The cover plate 240 can be made of glass, quartz, sapphire, transparent ceramics, etc., and can also be made of a wavelength conversion material according to different light color requirements. It should be noted that the present invention is not limited to using the cover 240 to seal each component in the bracket 200. In other embodiments, the cover plate may be omitted, and the groove 213 of the bracket 210 may be directly filled with silicon gel to cover all the components, thereby protecting the components on the bracket 210.

Specifically, the bracket 210 also includes a first circuit layer 2600 (that is, the front circuit layer) on the upper surface of the bracket body 210, and a second circuit layer 280 (that is, the lower surface of the bracket body 210). Back surface circuit layer), and an internal circuit layer 270 embedded in the bracket body 210. FIG. 2 is a top view of the LD chip 220 after being solid-soldered on the bracket 210, FIG. 3 shows a schematic diagram of the internal circuit layer 270 located in the bracket body 210, and FIG. 4 shows a bottom view of the 280 of the bracket 200 . The connection relationship between the first circuit layer 2600, the internal circuit layer 270 and the second circuit layer 280 will be described in detail below in conjunction with FIGS. 2 to 4. It should be noted that since FIG. 4 is a bottom view of the second circuit layer 270, the left-right positional relationship corresponding to the components in FIG. 2 is opposite.

The second circuit layer 280 includes four conductive electrodes 281 and a heat dissipation electrode 282. In order to clearly describe the electrical connection relationship between the components later, the conductive electrodes are represented by P1, P2, P3, and P4 in FIG. 4.

As shown in FIG. 2, the first surface 2113 of the bracket body 210 has four edge regions 210A to 210D, and a central region C for placing the optical element 230. The first circuit layer 2600 is located at the edge regions 210A to 210D of the first surface 2113 to be a component mounting region and has two mounting units 260. Each mounting unit 260 includes a first area 261, a second area 262, and a third area 263. The three areas are spaced apart from each other, and a conductive material is coated on the first surface 2113 of the bracket body 210. The first area 261 and the third area 263 serve as a first electrode block, and the second area 262 serves as a second electrode block. As shown in FIG. 3, the internal circuit layer 270 includes a plurality of circuit connection units 271-274. Taking the circuit connection units 271 and 272 as an example, the circuit unit 271 includes a starting end portion 2711 located at one of the edge regions 210A of the first surface 2113 of the bracket body 210, and a starting end portion 271 faces the The extension portion 2712 extending from the other edge area 210C of the first surface 2113 is two sets of the first conductive through member groups (via) A1 and C1 connected to the extension portion 2712 (illustrated by a black filled circle), and A second conductive through member group B1 connected to the starting end 2711 (shown by a circle filled with white in the figure). In addition, the starting end portion 2711 and the extending portion 2712 together constitute a circuit block. The circuit unit 272 includes a starting end portion 2721 located at one of the edge regions 210C of the first surface 2113 of the bracket body 210, and a starting end portion 272 extending toward the other edge region 210A of the first surface 2113. The extension portion 2722 is connected to the first conductive through member group A2 of the extension portion 2722 (indicated by a black filled circle), and a second conductive through member group B2 connected to the starting end 2721 (Figure (Shown with a white filled circle). In addition, the starting end portion 2721 and the extending portion 2722 together form a circuit block. The first conductive through element groups A1, A2, C2 of the circuit units 271, 272 extend upward to be connected to the first circuit layer 2600, and the second conductive through element groups B1, B2 extend downward to meet The conductive electrodes 281 are connected. That is to say, the bracket body 210 has more than three side surfaces connecting the first surface 2113 and the second surface 2113, and the start end of the circuit block of each circuit connection unit 271~274 of the internal circuit layer 270 is adjacent to On one side of the bracket body 210, the extension portion extends from the starting end toward the other side of the bracket.

In more detail, the first conductive through member group A1 of the circuit unit 271 is electrically connected to the first area 261 of the mounting unit 260, and the first conductive through member group A2 of the circuit unit 272 is electrically connected to the mounting unit 260 The second region 262 of the circuit unit 271 is electrically connected to the third region 263 of the mounting unit 260. The second conductive through member group B1 of the circuit unit 271 is electrically connected to the conductive electrode 282 of the second circuit layer 280, and the second conductive through member group B2 of the circuit unit 272 is electrically connected to the conductive electrode of the second circuit layer 280 P2.

Further, the circuit connection units 271, 272, 273, and 274 are divided into two first circuit connection units 271, 273 and two second circuit connection units 272, 274. The mounting unit 260 located on the left side of the first surface 2113 of the bracket body 210 is correspondingly electrically connected to one of the first circuit connection units 271 and one of the second circuit connection units 272 of the internal circuit layer 270. In this embodiment, another first circuit connection unit 273 is similar to the above-mentioned first circuit connection unit 271, and includes two sets of mounting units 260 on the right side of the first surface 2113 that are electrically connected to the first circuit layer 2600 A group of first conductive through-pieces, a group of second group of conductive through-pieces electrically connected to the conductive electrode P4 of the second circuit layer 280. Similarly, another second circuit connection unit 274 is similar to the above-mentioned second circuit connection unit 272, and includes a group of first conductive through-pieces electrically connected to the mounting unit 260 on the right side of the first surface 2113 and a group of electrical The second conductive through-piece group connected to the conductive electrode P1 of the second circuit layer 280 realizes the electrical connection relationship between the first and second circuit layers 2600, 280 (ie, the front and back electrode blocks). Taking the first circuit connection unit 271 and the second circuit connection unit 272 as an illustration, the first conductive through member groups A1, A2, and C1 at the starting end of each of the first and second circuit connection units 271, 272 are all located at On the extension portions 2712, 2722, the second conductive through-piece groups B1, B2 are located on the starting end portions 2711, 2721, so that the conductive electrodes 281 can be designed to be all disposed on the first part of the bracket body 210 As shown in FIG. 4, in the edge area of the second surface 2114, the second circuit layer 280 further includes a heat dissipation electrode 282 disposed in the central area P5 of the second surface 2114. Further, in the first circuit connection unit 271, the first conductive through-piece group A1 is arranged at a position closer to the second conductive through-piece group B1 than the first conductive through-piece group C1, for example, the A conductive through member group C1 can be disposed at a position of the extension portion 2712 far away from the starting end portion 2177. Specifically, the starting end portion 2711 of the first circuit connection unit 271 is located at the edge area 210A of the bracket body 210, the extension portion 2712 extends toward the edge area 210C of the bracket body 210, and the second conductive through member group B1 is located at The starting end portion 2711, the first conductive through member group A1 is located at a position of the extension portion 2712 close to the starting end portion 2711, the first conductive through member group C1 is located at the end of the extension portion 2712; the second circuit connection unit The starting end portion 2721 of 272 is located at the edge region 210C of the bracket body 210, the extension portion 2722 extends toward the edge region 210A of the bracket body, the second conductive through-piece group B2 is located at the starting end portion 2721, and the first conductive through The component group A2 is located at the end of the extension 2712. The first circuit connection unit 271 and the second circuit connection unit 272 are located on the left side area of the bracket 200 to form a first group of circuit connection units and are correspondingly and electrically connected to the mounting unit 260 on the left side of the first circuit layer 2600. The first circuit connection unit 273 and the second circuit connection unit 274 are located in the right area of the bracket 200 to form a second group of circuit connection units, and are correspondingly and electrically connected to the mounting unit 260 on the right side of the first circuit layer 2600.

In this embodiment, for ease of description, the first area 261, second area 262, and third area 263 of the mounting unit 260 on the left side of FIG. 2 are denoted by A, B, and A', respectively, and the mounting unit 260 on the right The first area 261, the second area 262, and the third area 263 are denoted by D, E, and D', respectively. The first area A, the second area B, and the first area A, the second area B, and the The third area A'constitutes the first installation unit 260; the first area D, the second area E, and the third area D'on the first surface 2113 of the bracket body 210 constitute the second installation unit 260 . Wherein, one LD chip 220 is placed in each first area A and first area D, and the LD chip 220 is connected to the second areas B and E through a plurality of leads 221; each third area A'and the first area An ESD protection element 250 is respectively placed in the three regions D′. The ESD protection element 250 is connected to the second regions B and E through a lead 251, and the optical element 230 is placed in the central region C of the first surface. Therefore, the first area A, A'and the third area D, D'of the first circuit layer 2600 are electrically connected through the internal circuit layer 270. The connection between the front and back electrode blocks of the first circuit layer 2600 and the second circuit layer 280 is as follows: the first area A and the third area A'are electrically connected to the conductive electrode 282, and the second area B is electrically connected to the conductive electrode P2, the first area D and the third area D'are electrically connected to the conductive electrode P4, and the second area E is electrically connected to the conductive electrode P1. The optical element 230 may be a reflective element or a ridge element with a side surface 231 with a high reflectivity slope, which can convert the emitted light in the horizontal direction of the LD chip 220 into a vertical direction to emit light. On the other hand, the position of the circuit connection units 271 to 274 of the internal circuit layer 270 projected to the first surface 2113 of the holder body 210 is located on the outer periphery of the position of the optical element 230. The positions where the second conductive through-piece group is projected onto the first surface 2113 of the bracket body 210 are located in the edge regions 210A to 210D of the first surface 2113.

In the packaging structure of this embodiment, by designing the circuit structure of the bracket 200, a single or multiple LD chips 200 (all equipped with ESD protection elements 250) can be packaged in the package cup, and multiple LD chips 200 can be packaged The switch can be independently controlled according to requirements to achieve adjustable brightness.

Further, the heat dissipating electrode 282 spaced from the conductive electrode 281 is provided in the central area P5 of the second surface 2114 (that is, the back surface) of the bracket body 210 to achieve thermoelectric separation, wherein the conductive electrode 281 on the back side passes through the internal circuit The circuit laid on the layer 270, the first and second conductive through-piece groups are electrically connected to the first, second, and third areas 261, 262, and 263 on the front side. The heat dissipation electrode 282 in the central area P5 on the back side can be connected with the ones to be installed later. A PCB circuit board 100 or a metal substrate of a heat sink is directly connected (as shown in FIG. 5), which can facilitate rapid heat dissipation of the laser package structure of the present invention.

Further, in a specific implementation aspect, the cover 240 may be a wavelength conversion material, for example, glass phosphors, ceramic phosphors, single crystal phosphors, etc. may be used. The thermal conductivity of this material is greater than 10W/ m·K. Preferably, the luminous angle after passing through the wavelength conversion material is less than 90°, and the light intensity in the normal direction is the largest. Due to the Stokes shift phenomenon and the efficiency of the wavelength conversion material during the wavelength conversion process, a certain amount of heat will be generated. The side 212 of the package cup with high thermal conductivity can be used as a heat dissipation channel for the wavelength conversion material at the same time. Heat transfer. Preferably, a high thermal conductivity bonding method is adopted between the cover plate 240 and the bracket 200 to achieve good heat dissipation. The methods include SAB (Surface Activated Bonding), ADB (Atomic Diffusion Bonding), etc., the cover plate 240 A transparent material with high thermal conductivity can also be used to bond with the bracket 200, and the thermal conductivity is preferably above 1W/(m•K).

Secondly, the pad as the conductive electrode 281 of the bracket 200 adopts a thermoelectric separation design, and the electrode on the back side is connected to the mounting unit of the bracket 200 through the circuit laid by the internal circuit layer 270, the first and second conductive through-piece groups. 260 connection, the heat dissipation electrode 282 located in the central area of the back is directly connected to the PCB circuit board 100 or the metal base of the heat sink to be installed subsequently, which facilitates rapid heat dissipation of the package structure.

Second embodiment

6 to 8 are a second embodiment of the laser package structure of the present invention. FIG. 6 shows a top view of the bracket body 210 after two LD chips 220 are fixedly soldered; the arrangement of the second circuit layer 280 is shown in FIG. 7, and the arrangement of the internal circuit layer 270 is shown in FIG. 8. It should be noted that since FIG. 7 is a bottom view of the second circuit layer 270, the left-right positional relationship corresponding to the components in FIG. 6 is opposite. On the other hand, in FIG. 8, the first electrically conductive through member group of the internal circuit layer 270 electrically connected to the first circuit layer 2600 is shown with a black filled circle, and the internal circuit layer 270 is connected to the second circuit layer 2600. The illustration of the second electrically conductive through member group electrically connected to the circuit layer 280 is indicated by a white filled circle. Specifically, in the first circuit layer 2600 of FIG. 6, in order to facilitate the description of the placement position and electrical connection of the components, the first area 261 is represented by A, D, F, and H, respectively, and the second area Denoted by B, E, J, and G, the third area is denoted by A', D', F', and H'respectively, and the first, second, and third areas 261, 262, and 263 are all used as electrode blocks. In the second circuit layer 280 of FIG. 7, for convenience of description, the conductive electrodes 281 are represented by P1~P4, P6~P9, the central area of the first surface 2113 of the holder body 210 is represented by C, and the second The central area of the surface 2114 is represented by P5. The first area A, the second area B, and the third area A'constitute the first installation unit 260; the first area D, the second area E, and the third area D'constitute the second The first area H, the second area J, and the third area H'together constitute the third installation unit 260; the first area F, the second area G, and the third area The three regions F′ together constitute the fourth installation unit 260. In addition, the internal circuit layer 270 has eight circuit connection units 271 to 278, which are divided into four first circuit connection units 271, 273, 275, and 277, and four second circuit connection units 272, 274, 276, and 278. . Further, the first circuit connection unit 271 and the second circuit connection unit 272 constitute a first group of circuit connection units, and are connected to the first area A and the second area B of the mounting unit 260 (as shown in FIG. 6) on the upper left. Electrically connected to the third area A', the first circuit connection unit 273 and the second circuit connection unit 274 constitute a second group of circuit connection units, and are connected to the first area of the mounting unit 260 (Figure 6) at the upper right D. The second area E and the third area D'are electrically connected. The first circuit connection unit 275 and the second circuit connection unit 276 form a third group of circuit connection units, and are connected to the mounting unit 260 at the bottom right (as shown in the figure). 6) The first area H, the second area J, and the third area H'are electrically connected. The first circuit connection unit 277 and the second circuit connection unit 278 constitute a fourth group of circuit connection units, and are connected to the lower left The first area F, the second area G, and the third area F'of the installation unit 260 (as shown in FIG. 6) are electrically connected.

The bracket 200 of the package structure can place four LD chips 220, and the LD chips 220 are respectively placed in the first regions A, C, F, and H of the mounting unit 260. In addition, the ESD protection element 250 is placed in the third area A', D', F', H'of the mounting unit 260, respectively. In the second embodiment, the first area A and the third area A', the first area D and the third area D', the first area F and the third area F', the first area H and the third area H'pass the internal circuit inside the stent body 210 The layers 270 are connected and electrically connected. The detailed electrical connection of each electrode block on the front and back is as follows: the first area A and the third area A'are connected to the conductive electrode P4 of the second circuit layer 280, and the second area B is connected to the second circuit layer The conductive electrode P3 of 280 is connected, the first area D and the third area D′ are connected to the conductive electrode P1 of the second circuit layer 280, and the second area E is connected to the conductive electrode P2 of the second circuit layer 280, The first area F and the third area F'are connected to the conductive electrode P9 of the second circuit layer 280, the second area G is connected to the conductive electrode P8 of the second circuit layer 280, and the first area H and the The third area H′ is connected to P6, and the second area J is connected to the conductive electrode P7 of the second circuit layer 280. The back central area P5 block is the heat dissipation electrode 282; the central area E of the first surface 2113 of the bracket body 210 is placed with the optical element 230, which can convert the light emitted from the LD chip 220 in the horizontal direction into light propagating in the vertical direction.

The third embodiment

Referring to FIGS. 7 and 9 to 10, they are a third embodiment of the laser package structure of the present invention. 9 shows the top view after the LD chip 220 is fixedly soldered on the support 200, the internal circuit layer 270 is arranged as shown in FIG. 10, and the second circuit layer 280 is arranged as shown in FIG. It should be noted that since FIG. 7 is a bottom view of the second circuit layer 270, the left-right positional relationship corresponding to the components in FIG. 9 and FIG. 10 are opposite. For the convenience of description, the four first regions 261 are represented by A, D, F, and H respectively, and the four second regions 262 are represented by B, E, G, and J respectively. In FIG. 10, the first electrically conductive through member group of the internal circuit layer 270 electrically connected to the first circuit layer 2600 is illustrated with a black filled circle, and the internal circuit layer 270 is electrically connected to the second circuit layer 280. The illustration of the connected second conductive through-piece group is indicated by a white filled circle.

The third embodiment is similar to the second embodiment. The difference is that in this embodiment, the optical element 230 of the laser package structure is placed along the diagonal line of the first surface 2113 of the package cup. Four mounting units 260 are provided at the four corners of the package cup, and each mounting unit 260 includes the first area 261 and the second area 262, wherein the LD chip 220 is mounted on the first area 261 , And as close as possible to or on the diagonal diagonal of the first surface 2113 of the package cup. As shown in FIG. 10, the internal circuit layer 270 has a plurality of circuit connection units located on the upper and lower edge regions of the second surface 2114 of the bracket body 210. Each circuit connection unit has a block structure, and one circuit The connecting unit 271 illustrates that the second conductive through element group B1 is adjacent to the edge of the bracket 200, and the first conductive through member group A1 is located inside the bracket 200 compared to the second conductive through member group B1, front and back The connection method of the electrode blocks is as follows: the first area A and the conductive electrode P4 are electrically connected by the internal circuit layer 270, the second area B is connected with the conductive electrode P3, and the second area E is connected by the conductive electrode P2. The inner circuit layer 270 is electrically connected, the first area D and the conductive electrode P1 are electrically connected by the inner circuit layer 270, the first area F and the conductive electrode P9 are electrically connected by the inner circuit layer 270, and the second area G and the conductive electrode P8 are electrically connected by the internal circuit layer 270, the second region J and the conductive electrode P7 are electrically connected by the internal circuit layer 270, and the first region H and the conductive electrode P6 are electrically connected by the internal circuit layer 270 Electric connection.

Through such a circuit design, on the one hand, the size of the packaging structure can be reduced to a certain extent, on the other hand, the layout of the internal circuit layers is simplified, and the reliability of the laser packaging structure of the present invention is improved.

Fourth embodiment

Refer to Fig. 7 and Figs. 11-12, which are a fourth embodiment of the laser package structure of the present invention. Wherein, FIG. 11 shows a top view of the LD chip 220 after the LD chip 220 is fixedly soldered on the support 200, the arrangement of the internal circuit layer 270 is shown in FIG. 12, and the arrangement of the second circuit layer 280 is shown in FIG. It should be noted that since FIG. 7 is a bottom view of the second circuit layer 270, the left-right positional relationship corresponding to the components in FIG. 11 and FIG. 12 is opposite. In FIG. 12, the first electrically conductive through member group in the internal circuit layer 270 that is electrically connected to the first circuit layer 2600 is shown with a black filled circle, and the internal circuit layer 270 and the second circuit layer 280 The illustration of the second electrically conductive through-piece group that is electrically connected is indicated by a white filled circle.

In this embodiment, the optical element 230 of the packaging structure is also placed along the diagonal line of the first surface 2113 of the packaging cup, and four mounting units 260 are provided at the four corners of the packaging cup. The fourth embodiment is similar to the third embodiment. The difference is that the arrangement of the bracket 210 and the internal circuit layer 270 is different. Each mounting unit 260 includes a first area 261, a second area 262, and a third area. In the area 263, the LD chip 220 is mounted on the first area 261 as close as possible to or on the diagonal diagonal of the package cup. The ESD protection element 250 is located in the third area 263. As shown in FIG. 12, the internal circuit layer 270 has four first circuit connection units 271, 273, 275, and 277 and four second circuit connection units 272, 274, 276, and 278. For the convenience of description, the four first regions 261 are represented by A, D, F, and H respectively, the four second regions 262 are represented by B, E, G, and J respectively, and the four third regions 263 They are represented by A', D', F', and H'respectively. In FIG. 12, the first circuit connection unit 271 is used to illustrate that the first conductive through member group A1 of the first circuit connection unit 271 is connected to the first region 261 of the first circuit layer 2600, and the first conductive through member group C1 is connected to the third area 263 of the first circuit layer 2600, and the second conductive through member group B1 is connected to the conductive electrode 281 of the second circuit layer 180. Preferably, the second conductive through element group B1 is located at the edge area of the bracket 200, and the first conductive through member groups A1 and C1 are located inside the bracket 200 compared to the second conductive through member group B1. In a specific implementation, the first circuit connection unit 271 includes: the starting end portion 2711 located adjacent to the edge region 210C of the bracket, a first extension portion 2712 connected to the starting end portion 2711 The connecting portion 2713 of the first extending portion 2712, a second extending portion 2714 and the end portion 2715 connected to the connecting portion 2713. The second conductive through element group B1 is located at the start end 2711, the first conductive through element group A1 is located at the connecting portion 2713, and the first conductive through element group C1 is located at the end portion 2715.

In this embodiment, the connection of the front and back electrode blocks is as follows: the first area A and the third area A'are electrically connected to the conductive electrode P4 by the internal circuit layer 270, and the second area B is electrically connected to the conductive electrode P4. The electrode P3 is electrically connected, the first area D and the third area D'are electrically connected to the conductive electrode P1, the second area E is electrically connected to the conductive electrode P2, the first area F and the third area F' Is electrically connected to the conductive electrode P9, the second area G is electrically connected to the conductive electrode P8, the first area H and the third area H'are electrically connected to the conductive electrode P6, and the second area J is electrically connected to the conductive electrode P8 P7 electrical connection. In this embodiment, the size of the laser package structure can be reduced to a greater extent, or a larger size LD chip can be compatible in a package cup with the same package size as the current laser package structure.

The previous embodiments have listed several different circuit distribution forms. It should be understood that the present invention is not limited to the above-mentioned circuit distribution patterns, and can be designed according to the specific package cup shape or the size and quantity of the laser chip. The patterns of each circuit layer can meet actual application requirements.

Fifth embodiment

Refer to FIG. 13, which is a fifth embodiment of the laser packaging structure of the present invention. The laser packaging structure includes the bracket 200, the laser chip 220, the optical element 230 and the cover 240. The fifth embodiment is similar to the first embodiment, except that the cover 240 of the first embodiment includes a metal frame 241 and a wavelength conversion layer 242 surrounded by the metal frame. The metal frame 241 forms an opening and embeds a wavelength conversion material as the wavelength conversion layer 242. The opening of the metal frame 240 can be set into one or more window structures according to the shape of the light spot (as shown in FIGS. 14 and 15). It should be noted that the wavelength conversion layer 242 can also be replaced by a transparent material that does not convert the wavelength of light.

In this embodiment, a light-emitting area is formed only at a position corresponding to the cover 240 above the optical element 230 to reduce the light-emitting angle of the laser package structure, and the metal frame 241 with high thermal conductivity can be The heat generated by the wavelength conversion layer 242 is more easily conducted.

Refer to Fig. 16 for another form of the fifth embodiment. The wavelength conversion layer 242 of this embodiment is formed on the surface of the metal frame and covers the opening, so that the contact area between the wavelength conversion layer 242 and the metal frame 241 can be increased, and the heat dissipation performance of the wavelength conversion layer 242 can be further improved.

Sixth embodiment

Referring to FIG. 17, a sixth embodiment of a laser packaging structure of the present invention discloses a laser packaging structure, which includes the bracket 200, the laser chip 220, the optical element 230 and the cover 240. The sixth embodiment is similar to the first embodiment. The difference is that the optical element 230 is a bevel with a highly reflective inclined surface, and includes an incident surface 234, a reflective surface 235, and an exit surface 233. In this embodiment, the wavelength conversion layer (not shown in the figure) can be directly disposed on the incident surface 234 or the exit surface 233. Preferably, the optical element 230 is precisely processed from a material with high transmittance and high thermal conductivity, and its thermal conductivity is preferably at least 5 W/(m·K). When the thickness of the optical element 230 is 1mm, the transmittance (@450nm/thickness 1mm) of the blue light with a wavelength of 450nm is preferably above 80%. The material can be high thermal conductivity glass, silicon dioxide, sapphire, transparent ceramics, etc. .

Referring to Fig. 18, a light source module using the aforementioned laser package is simply shown. Since the small angle light source is easier to illuminate the specified area, the small angle laser light source has obvious advantages in the field of high-directivity lighting or communication, such as car headlights, high bay lights, fishing lights, navigation lights, projectors, laser TVs, Optical communications, etc. The light source module includes one of the above-mentioned laser packaging structures. Specifically, as shown in FIG. 18, in a matrix array light source module 300, a plurality of laser light sources 310a, 310b, 310c, 310d, and 310e include those of the first to sixth embodiments of the aforementioned laser package structure One of them can be independently controlled by the circuit design. The light emitted by the light source is processed by the optical system of a lens 320 or a mirror (not shown in the figure); in the irradiable range 330a, 330b, 330c, 330d, 330e In other areas, realize the lighting in the designated area. Specifically, if the headlights of a car should be used, when meeting a car at a short distance or encountering a pedestrian, the high beam in the driving range of the other party needs to be turned off to ensure road traffic safety. The solution proposed in this embodiment can control to turn on the light sources 330b and 330c, so as to realize lighting only in the lighting areas 330b and 330c, which not only satisfies the own driving lighting, but also avoids the safety hazards caused by the strong light irradiation of the other party.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

200: bracket 210: Bracket body 210A, 210B: edge area 210C, 210D: edge area 211: bottom 2111: High 2112: lower part 2113: First Surface C: Central area 2114: second surface 2115: vertical surface P5: Central area 212: Side 213: Groove 214: Top Surface 220: Laser chip 220A: Light emitting end face 221: Lead 230: optical components 231: side 232: top surface 233: exit surface 234: incident surface 235: reflective surface 240: cover 241: Metal frame 242: wavelength conversion layer 243: open 250: Antistatic component 251: Lead 2600: the first circuit layer 260: installation unit 261: The first area A, D, F, H: first area 262: The second area B, E, G, J: second area 263: Third Area A’, D’, F’, H’: third area 270: Internal circuit layer 271, 272, 273, 274: circuit connection unit 275, 276, 277, 278: circuit connection unit 2711, 2721: starting end 2712, 2722: Extension 2713: connecting part 2714: second extension 2715: End A1, A2, C1: the first conductive through-piece group B1, B2: The second conductive through-piece group 280: second circuit layer 281: Conductive electrode 282: cooling electrode P1, P2, P3, P4: conductive electrodes P6, P7, P8, P9: conductive electrodes d: height difference 310a, 310b: laser light source 310c, 310d, 310e: laser light source 320: lens 330a, 330b: irradiation range 330c, 330d, 330e: irradiation range 100: circuit board

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: 1 is a schematic cross-sectional view illustrating the first embodiment of the laser packaging structure of the present invention, and a first circuit layer and an internal circuit layer are omitted; FIG. 2 is a schematic top view illustrating the solid bonding of a chip on a support of the first embodiment; Figure 3 is a schematic diagram illustrating the internal circuit layers of the first embodiment; 4 is a schematic bottom view illustrating a second circuit layer of the first embodiment; FIG. 5 is a schematic cross-sectional view illustrating the connection structure of the first embodiment and a PCB substrate; 6 is a schematic top view illustrating a second embodiment of the laser packaging structure of the present invention; FIG. 7 is a schematic bottom view illustrating the second circuit layer of the second embodiment; FIG. 8 is a schematic diagram illustrating the internal circuit layer of the second embodiment; 9 is a schematic top view illustrating a third embodiment of the laser packaging structure of the present invention; FIG. 10 is a schematic diagram illustrating the internal circuit layer of the third embodiment; 11 is a schematic top view illustrating a fourth embodiment of the laser packaging structure of the present invention; FIG. 12 is a schematic diagram illustrating the internal circuit layer of the fourth embodiment; 13 is a schematic cross-sectional view illustrating a fifth embodiment of the laser packaging structure of the present invention; 14 is a schematic top view illustrating a wavelength conversion layer and a metal frame of the fifth embodiment; Figure 15 is another variation of Figure 14; Figure 16 is a schematic cross-sectional view illustrating yet another modification of the fifth embodiment; 17 is a schematic cross-sectional view illustrating a sixth embodiment of the laser package structure of the present invention; and 18 is a schematic diagram illustrating a light source module including the laser package structure of the present invention.

200: bracket

210: Bracket body

211: bottom

2111: High

2112: lower part

2113: First Surface

2114: second surface

2115: vertical surface

212: Side

213: Groove

214: Top Surface

220: Laser chip

220A: Light emitting end face

230: optical components

231: side

232: top surface

280: second circuit layer

281: Conductive electrode

282: cooling electrode

d: height difference

Claims (34)

A laser packaging structure, including: A bracket includes a bracket body having opposite first and second surfaces, a first circuit layer on the first surface of the bracket body, and a second circuit layer on the second surface of the bracket body , And an internal circuit layer embedded in the bracket body, the internal circuit layer has a plurality of circuit connection units, each circuit connection unit has a circuit block, a first conductive circuit connecting the circuit block and the first circuit layer A group of through components (via), and a second group of conductive through components connecting the circuit block and the second circuit layer; and At least one laser chip is fixed on the first circuit layer of the bracket and can emit a laser beam. The laser packaging structure according to claim 1, wherein the internal circuit layer of the bracket includes more than four circuit connection units. The laser packaging structure according to claim 1, wherein the circuit connection units of the internal circuit layer are divided into at least one first circuit connection unit and at least one second circuit connection unit. The laser package structure according to claim 3, wherein the circuit connection units of the internal circuit layer are divided into a plurality of the first circuit connection units and a plurality of the second circuit connection units, the first The circuit layer includes more than two mounting units, the laser package structure includes two laser chips, each mounting unit includes a first area and a second area spaced apart and conductive, and each laser chip Is disposed on the first area of one of the mounting units, the first area is electrically connected to the first circuit connection unit of the internal circuit layer, and the second area is electrically connected to the first circuit connection unit of the internal circuit layer. The second circuit connection unit forms a circuit connection. The laser package structure according to claim 4, wherein the mounting unit of the front circuit layer corresponds to the first circuit connection unit and the second circuit connection unit of the internal circuit layer. The laser package structure according to claim 4, wherein each mounting unit of the first circuit layer further has a third area separated from the first area and the second area, and each first circuit The connection unit has more than two groups of first conductive through-pieces, which are respectively connected to the first area and the third area of the first circuit layer. The laser packaging structure according to claim 6, wherein the first area of each mounting unit is electrically connected to the third area through the first conductive through-piece group of the first circuit connection unit, and The second area is electrically connected to one of the second circuit connection units of the internal circuit layer. The laser package structure according to claim 7, wherein, in each mounting unit, the area of the first area is greater than the total area of both the second area and the third area. The laser package structure according to claim 1, wherein the circuit block of each circuit connection unit of the internal circuit layer has a start end adjacent to one side of the bracket body, and the first end of the circuit connection unit Two conductive through element groups are connected to the starting end of the circuit block, and the first conductive through element group is connected to the other end of the circuit block on the side away from the bracket body. The laser package structure according to claim 9, wherein the second circuit layer of the bracket includes a plurality of conductive electrodes disposed on the second surface of the bracket body, and the conductive electrodes are located at the edge of the second surface area. The laser packaging structure according to claim 10, wherein the second circuit layer of the bracket further includes a heat dissipation electrode located in the central area of the second surface of the bracket body. The laser package structure according to claim 11, wherein the conductive electrodes of the second circuit layer are located on two opposite sides of the heat dissipation electrode and are spaced apart from the heat dissipation electrode. The laser package structure according to claim 10, wherein each laser chip is connected to one of the first circuit connection units of the internal circuit layer and two of the conductive electrodes of the second circuit layer. The laser package structure according to claim 1, further comprising an optical element disposed on the first surface of the holder body and responding to the laser chip emitting a second parallel to the holder The light in the horizontal direction of a surface undergoes light reflection and becomes a light emission in the vertical direction perpendicular to the first surface. The laser package structure according to claim 14, wherein the optical element is located in a central area of the first surface of the holder body, and the laser chip surrounds the optical element. The laser package structure according to claim 14, wherein the position where the circuit connection unit of the internal circuit layer is projected onto the first surface of the bracket body is located on the outer periphery of the position of the optical element. The laser package structure according to claim 1, wherein the projected position of the second conductive through member group onto the first surface of the bracket body is located at an edge area of the first surface. The laser packaging structure according to claim 1, wherein the bracket body has three or more side surfaces connecting the first surface and the second surface, and the circuit block of each circuit connection unit of the internal circuit layer has A starting end and an extension, the starting end is adjacent to one of the side surfaces of the bracket body, and the extension is extending from the starting end toward the other side of the bracket. The laser package structure according to claim 1, wherein the bracket is formed with a groove, and the groove is rectangular in cross section parallel to the first surface of the bracket body, and the laser chip is located in the groove , And adjacent to or located on one of the diagonals of the rectangle. A laser packaging structure, including A bracket includes a bracket body with opposite first and second surfaces, a first circuit layer on the first surface of the bracket body, and a second circuit layer on the second surface of the bracket body , And an internal circuit layer embedded in the bracket body, the first circuit layer includes at least two mounting units, each mounting unit includes a first area and a second area spaced apart from each other, the internal circuit layer has A plurality of circuit connection units, each circuit connection unit having a circuit block, a first conductive through-piece group connecting the circuit block and the first circuit layer, and a second circuit block connecting the circuit block and the second circuit layer Group of conductive through-pieces; and At least two laser chips are respectively mounted on the first area of each mounting unit of the first circuit layer of the bracket and can emit a laser beam. The laser package structure according to claim 20, wherein at least one of the mounting units further includes a third area separated from the first and second areas, and the third area is connected to the inner circuit layer through the internal circuit layer. The first area forms an electrical connection; the laser package structure further includes at least one antistatic element, and the at least one antistatic element is installed in the third area. The laser package structure according to claim 21, wherein the circuit connection unit is divided into a plurality of first circuit connection units and a plurality of second circuit connection units, and each first circuit connection unit has more than two groups The first conductive through element group, the first area is connected to the circuit block of the first circuit connection unit through a group of first conductive through element groups, and the third area is connected through another group of first conductive through element groups It is connected to the circuit block of the first circuit connection unit, so that the first area is electrically connected to the third area through the first circuit connection unit. The laser package structure according to claim 21, wherein the second conductive through member group is connected to a starting end of the circuit block adjacent to one side of the bracket body, and the first conductive through member The group is connected to the other starting end of the side of the circuit block away from the bracket body. The laser packaging structure according to claim 21, wherein the internal circuit layer includes more than four circuit connection units. The laser package structure according to claim 22, wherein the second regions of the respective mounting units of the first circuit layer are electrically connected to the second circuit connection units of the internal circuit layer. The laser package structure according to claim 25, wherein one of the mounting units of the first circuit layer corresponds to one of the first circuit connection units and one of the internal circuit layers. The second circuit connection unit. The laser package structure according to claim 23, wherein the second circuit layer includes a plurality of conductive electrodes disposed on the second surface of the bracket body, and the conductive electrodes are located at the edge area of the second surface. The laser packaging structure according to claim 27, wherein the second circuit layer of the bracket further includes a heat dissipation electrode located in the central area of the second surface of the bracket body. The laser package structure according to claim 28, wherein the conductive electrodes of the second circuit layer are located on two opposite sides of the heat dissipation electrode and are spaced apart from the heat dissipation electrode. The laser package structure according to claim 28, wherein each of the laser chips is connected to two circuit connection units of the internal circuit layer, and is connected to two of the conductive circuits of the second circuit layer. electrode. The laser package structure according to claim 21, wherein the position where the second conductive through member group of the circuit connection unit is projected onto the first surface of the bracket body is located at the edge area of the first surface. The laser package structure according to claim 21, wherein the bracket body has three or more side surfaces connecting the first surface and the second surface, and the circuit block of each circuit connection unit of the internal circuit layer has A starting end and an extension, the starting end is adjacent to one of the side surfaces of the bracket body, and the extension is extending from the starting end to the other side. The laser package structure according to claim 21, wherein the bracket is formed with a groove, and the groove parallel to the first surface of the bracket body is rectangular in cross section, and the laser chip is located in the groove , And adjacent to or located on one of the diagonals of the rectangle. A light source module including one of the laser packaging structures described in claim items 1 to 33.

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